To secure properly the ICON Network all the P-Reps should run a node (not just Main P-Reps). ICON Network is built in such a way if that all 22 P-Reps are down then the next 22 Sub P-Reps can replace the P-Reps and run and secure the ICON Network properly. Additionally, Sub P-Reps run citizen nodes, which provide a copy of the ledger and enhance the decentralization and availability of the network. As a minimum contribution, all P-Reps should have their node properly configured and running. Since Sub P-Reps receive fewer rewards, we would expect their nodes to be scaled down into configurations that can run on a $50-$100 estimated monthly cost.
Our proposal is to add a node uptime indicator to the tracker for all the P-Reps and Sub P-Reps. All the P-Reps and Sub P-Reps will be expected to maintain an uptime of 85% for their node, with an initial grace period to get their node up and running. If, after the grace period, a P-Rep does not comply with the 85% uptime requirement, then the P-Rep will be automatically removed from ICON Network.